It is a metaphor because the sentence is comparing two different things without using the word "as" or "like".
The correct answers are (B) <em>The British Empire and the French Republic, linked together in their cause and their need, will defend to the death their native soils, aiding each other like good comrades to the utmost of their strength, even though a large tract of Europe and many old and famous States have fallen or may fall into the grip of the Gestapo and all the odious apparatus of Nazi rule.</em> and (C) <em>We shall not flag nor fail. We shall go on to the end. We shall fight in France and on the seas and oceans; we shall fight with growing confidence and growing strength in the air</em>. In both of these extracts, Churchill explains how the combined power resulting from the collaboration with their allies like France could channel the ultimate victory over the threat to freedom that the Gestapo and the Nazis represented.
